jentzsgh



(No Model.)

R. B. JENTZSGH.

Compound Metal Working Machine,

No. 234,037. Patented'Nov. 2,- 1880.

N.PETERS, FHDTLLLITHDGRAFHER. WSHINGTON. D C.

' UNITED STATES PATENT OFFICE.

ROBERT B. JENTZSOH, OF NEW YORK, N. Y.

COMPOUND METAL-WORKING MACHINE.

SJPECIFICATION forming part of Letters Patent No. 234,037, dated November 2, 1880.

Application filed .Tune 17, 1880. (No model.) PatentedinBelgium, May 5, 1880.

To all whom it may concem:

Be it known that I, ROBERT BRUNo JENTZSGH, a citizen of the United States, residing at New York, in the county and State of New York, have iuvented new and useful Improvements in Oompound Metal-Working Machines, of which the following is a specification.

This iuvention relates to a machine especially adapted for cutting sheet metal.

The, peculiar construction and arrangem-ent of the mechauism for Operating the cutters admits of the connection with such mechanism of devices for punching sheet metal, cutters for cutting metal rods or bars, and devices for 'bendin g the same.

The improvement consists in the features of constructionl and combination hereinafter described, and particularly pointed out in the claims.

Inthe drawings, Figure l is a side elevation of a machine einbodying my improvement. Fig.2 is a top or plan view of the same. Fig. 3 is a detail view, illustrating the sides of the cutter-jaws F G, which are opposite to those shown in Fig. l. Figs. 4 and 5 show the two levers A and B detaehed from the machine, said levers being drawn upon areduced scale.

Similar letters indicate corresponding parts.

In the drawings the letters A B designate two arms or levers, the flat surfaces of whose oheeks X bear against each other. These cheeks X are perforated to allow the passage of a pivot or bolt, e, about which the levers A B swing. The bearings of this lbolt are in standards O, rising from the base-plate J, which, as well as the working parts of rthe machine, are preferably of metal. These standards, as well as the cheeks X, are preferably pierced with several holes, d, so that by placin g the bolt or pin e nearer to or farther from those ends of the arms A B to which power is applied a corresponding decrease or increase in power is obtained. The bolt e may be provided with nuts or 'keys for the purpose of drawing together the standards O and cheeksXandpreventinganylateralmovement. For the purpose of imparting motion I provide a rod or rods, H, and lever D, by which the levers A B can be approached to and separated from each other.

In order to lessen the friction of the end of the lever on the plate 8, I provide rollers 80, over which it may glide.

Between the cheeks X and the ends of the levers A B, to which power is applied, are recesses for receiving knives or cutters h. A projeotng arm, E, is cast, or otherwise fastened onto the lever A or its cheek X, and is preferably tapped for the reception of a screw, 5. When a rod or other object is placed between the cutters h it is held in a horizontal position by striking against the end of the screw 5. These cutters are only applicablein Cutting bars, rods, or flat metal, as the length of cut is limited by the length of the cutters, and the cheeks X and the standards C would prevent the forward motion of a sheet of metal.

In order to cut sheets of metal I provide the following device: Through the standards (J passes a bolt, '5, which, besides holding the standards together, serves as the a-xis of the two jaws F and G. F is the head or upper jaw, and is provided with a lever-arm, F'. G is the lowerjaw or head, and is provided with an arm, G'. At 92 and f2 a knife is inserted into the heads the same as in any common shears. Following the direction of the cutting-edge ofknife2 runs a groove,f, through the neck of the head F, having such depth that its inner or rear face is in' line with the cutting-surface of the knife, thus permitting the passage of one part of the cut sheet or piece through it in direction of arrow 7. In order to give sufficient strength to the head thus grooved it is necessary to thicken it correspondingly along the edge of the above-named groove. This strengthening-piece f4 has the form of a wedge, pointing to the vertex of the angle formed by the cutting-edges of the two knives. The upper surface, fg, ot' this wedge has the same direction as the cuttingedge of knife 92, thus permitting the passage of the other part of the cut sheet or piece of metal over it in direction of arrow 6. The strengthening-piece f4 is shown in dotted lines iu Fig. 1, and in full lines in Fig. 3. On the arm B, and fixed to the same, is a lug or eye, g, and in the same manner as lug IOO f is fixed to the short arm or head a of the lever A. The lugg is connected to arm G' by a bolt or pin, g', passing through both, and in the same way by bolt f lugf is connected to arm F'. To allow motion of the two arms F' and G', it is necessary that these bolts f' and g' be movable in a slot either in the arms or in the lugs through which they pass. Therefore, as shown in the drawings, the boltsf' and g' are fast in their respective lugs, while the arms have longitudinal holes or slits, thus enabling them to slide and thereby insnre the proper motion.

For punching, I provide the following` arrangement: The head a of the lever A and the head b ot' the lever B are formed in such a manner as to bring their ends or faces opposite each other. ln the upper head, a, is a recess or hole serving for the reception of a punch, l, or other similar instrmnent, which is held there by a set-screw, m. In the lower part or head, b, is also a recess or hole for receiving a die, l', or similar tool corresponding to that in a. Set-screws m', preferably four in number, are inserted in head b, and serve to hold the die l' and to adjust it in exact juxtaposition to the punch or other instrument inserted in a. In the lower head, b, extending from the center of the recess, serving for the reception of the die, is an opening or hole, n', (shown in dotted lines,) which forms an outlet for the pieces that are punched out. Un the cheek X of the arm B is fastened, by serews or other- Wise, a fork, c, or stripper, which reaches over the hole in the die. The holes in this fork, through which the screws pass that serve to fasten it onto the check X, will be made in the form of Vertical slots, so as to permit of raising or lowering the fork to suit any thickness of metal to be punched. This fork serves to strip ofl' the metal adhering to the punch after a hole has been made.

The apparatus for bending or straightening metal is constructed as follows: Atyy on the arms A and B are lugs cast or otherwise fastened to the same on opposite sides directly in front of the cutter-recesses.

This machine is used in the following manner: For cutting of rod, bar, and flat metal, the bolt e is t-o be introduced into the hole d next to these cutters, thus placing the fulcrum of the lever to be used as near as possible to the center of the cutters I', in order to give the greatest possible force to the same. The setscrew 5 is turned so as to hold the object to be cut in a horizontal position. This object, which may he a bar, rod, or the like, is now placed between the cutter b, and the two arms A and B are drawn together by the lever arrangement shown in the drawings. When the arms A and B close the cutters h h pass each other with their cntting-edges, and thus sever the object placed between them. These cutters h may have straight edges, or one or both of their edges may have scallops or indentations to suit the shape of the rods or bars to be cut.

For shearing plate or sheet metal with the plate-shears F F' G the main bolt e remains in the same hole as for cutting bars, &c. By closing the arms A and B both lugs g andf make a downward movement, the lug g, secured to or formed with the long arm of the lever B, moving down with said arm, and the lng f, secured or formed with the head a ot' the lever A, likewise moving down with said head, which will, as a matter of course, be depressed as the arm A rises, owing to the fact that these levers cross each other at their parts designated as cheeks X. These lugs g and f being, by bolts g' and f''l connected to arms F' and G', the latter consequently must make the same movement, causing the two parts of the shears to turn around their common axis i, thus closing the jaws of the same and cutting the metal brought between the knives f 2 and g. After one cut has been made, and while the arms A and B are beingr opened again, the metal plate or other article should be shoved along, and in this movement of the plate one part of it passes through the groove f in direction of arrow 7, while the other part slides over the wedge-surfacef3 of the wedge-shaped strengthening-piecef*1 in the direction of arrow 6. For bendin g and the like, the main bolt e remainsin the same hole asbefore. Forpunching holes and the like it is advantageous to remove the bolt e from the hole it has been in for the above-described purposes, and to insert it in the holednext to the heads aand b,thus obtainiug the greatest possible leverage. While workin g the machine with the main bolt in this hole d it is necessary to remove holts f' and g' so as to liberate the shearing apparatus F F' and G G', as it could not well follow the altered movement of the arms A and B. The metal to be punched is placed upon the die l', the arms A and B are closed, and the punch enters and pierces the metal, dropping the piece punched out through the hole n'. On opening the arms A B again the punch which has been forced through the metal draws the latter with it upward again till it strikes the fork, which strips it ofi', and the operation can be repeated.

The tools for bending consist of two parts or dies, t and u, male and female, inserted into the arms A and B, and fastened there with setscrews. Both dies t and u have the angle or form into which a piece of metal is to be bent. A piece of metal to be bent is laid across the opening in the bottom or female die, u, the arms A and B are closed, and the top die, t, is pressed into the bottom die, u, and thus the bar, rod, or other piece of metal is bent into the proper angle. These dies may also be fastened in the heads a b, if desired, by means of set-screws similar to those used for fastening the punch l and die l' in Fig. 1.

What I claim is-- IOO ' 1. The'coinbination, with the levers A and B, pivoted together by a bolt, e, of a pair of cutter-jaws, F G, respectively provided 'with lever-arms F' G', extending in opposite directions from the fulcrunl of said jaws, the arm F' being connected with the short arm or head a of the lever A by a sliding connection, and the arin GI being connected With the long arm of the lever B in a similar manner, whereby, as the long arms of the levers A and B are opened or closed the cutter-jaws F and G will have a corresponding movement, substantially as dcscribed.

2. The combination, with the levers A and B, pivoted together by a bo1t,e, having its bearings in the standards O, of a pair of cutter-jaws, FG, pivoted together by a bo1t,i, having its bearings in the standards G above the bearings of the fulcrum or bolt of the lower levers, A B, the long arms F' G' of the said cutter-jaws, the lug f upon the short arm 01' head a of the lever A, the lug g upon the long arm of the lever B, and the bolts f' g' passing through slots so as to connect the Iever-arms F' G' with the said Iugs, substantially in the manner and for the purpose described.

3. A pair of levers, A and B, pivoted together and provided With jaws or heads a b, in combination with a pair of cutter-jaws, F G, respectively provided With the lever-arms F' G', extending on opposite sides of the fulcrum of said jaws, the lever-arm F' being detachably connected by a sliding connection with thejaw or head a, of the lever A, and the lever-arm G' being detachably connected with the 'lever B by a sliding connection, substantially as and for the purpose described.

4. The improved machine consisting of the standards O, pivoted levers A B, having heads a b, punch l, stripper a, die l', bar-cutting device h h, benders t u, shearing device F G F' G', iever D D', links H H, and rollcrs 80, all constructed and arranged as described.

In testirnony whereof I have herennto set my hand and seal in the presence of two subscribing Witnesses.

ROBERT B. JENTZSOH.

Witnesses:

J. HERMANN WAHLERs, E. F. KASTENHUBER. 

